Out Bad: A True Story About Motorcycle Outlaws is available on Amazon.com at http://www.amazon.com/Out-Bad-Donald-Charles-Davis/dp/1467950831/ref=sr_1_1?s=books&ie=UTF8&qid=1321895927&sr=1-1
The Aging Rebel: Dispatches From The Motorcycle Outlaw Frontier is available on Amazon.com at http://www.amazon.com/Aging-Rebel-Dispatches-Motorcycle-Frontier/dp/146796011X/ref=sr_1_2?s=books&ie=UTF8&qid=1321895971&sr=1-2
Of course, they are both just superb.